Method for preparing refined industrial salt from industrial waste salt

A technology for industrial waste salt and industrial salt, applied in the field of resources and environment, can solve the problems of surrounding soil, groundwater sources, safety hazards, environmental pollution, etc., and achieve significant economic and environmental benefits, reliable principles, and low-cost effects.

Inactive Publication Date: 2019-10-25
TIANJIN UNIVERSITY OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing treatment methods mainly include landfill and stacking, and the slag salt with a salt content of more than 10% is restricted for landfill disposal; some units use water to dissolve and dilute it and then discharge it. Such treatment is only a transfer of pollution and will cause huge environmental pollution
Due to the water-soluble characteristics of slag salt, there are great safety hazards in stacking and landfilling. Leakage will affect the surrounding soil and groundwater sources, posing a great threat to the environment.

Method used

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  • Method for preparing refined industrial salt from industrial waste salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Industrial waste salt pretreatment: 1000kg of industrial waste salt (containing 80wt% of sodium chloride, 14wt% of water, 5wt% of organic matter, 1wt% of water-insoluble matter, and 20ppm of total heavy metals) was crushed, sieved, and fully uniformly mixed , enter the rotary dehydration device, use natural gas to heat the hot air, heat at 150°C for 15 minutes, remove part of the water and volatile organic compounds, and obtain 855kg of pretreated waste salt; the pretreated tail gas obtained from the pretreatment is transported to the tail gas post-treatment process;

[0057] (2) Carbonization: transport the pretreated waste salt to the fluidized furnace carbonization device, use the high-temperature oxidation tail gas from the high-temperature oxidation device, heat the pretreated waste salt at 450°C, and carbonize the organic matter in the pretreated waste salt after 6 seconds. Obtain 835 kg of carbonized waste salt; the carbonized tail gas from the outlet of the f...

Embodiment 2

[0064] (1) Industrial waste salt pretreatment: 1000kg of industrial waste salt (containing 85wt% of sodium sulfate, 10wt% of water, 4.5wt% of organic matter, 0.5wt% of water-insoluble matter, and 10ppm of total heavy metals) was pulverized, sieved, and fully uniformly mixed Finally, enter the flash dehydration device, use natural gas to heat the hot air, heat at 140°C for 15 minutes, remove part of the water and volatile organic compounds, and obtain 895kg of pretreated waste salt; the pretreated tail gas obtained from the pretreatment is transported to the tail gas post-treatment process;

[0065] (2) Carbonization: transport the pretreated waste salt to the pulse carbonization device, use the high-temperature oxidation tail gas from the high-temperature oxidation device, heat the pretreated waste salt at 400°C, and carbonize the organic matter in the pretreated waste salt after 10s , to obtain 875 kg of carbonized waste salt; the carbonized tail gas from the outlet of the pul...

Embodiment 3

[0072] (1) Industrial waste salt pretreatment: 1000kg of industrial waste salt (containing 75wt% of sodium chloride, 9.5wt% of moisture, 5wt% of sodium sulfate, 10wt% of organic matter, 0.5wt% of water insoluble matter, and 30ppm of total heavy metals) was pulverized, After sieving and mixing fully and evenly, enter the rake-tooth dehydration device, use natural gas to heat the hot air, heat at 160°C for 10 minutes, remove part of the water and volatile organic compounds, and obtain 897kg of pretreated waste salt; the pretreated tail gas is transported To the tail gas post-treatment process;

[0073] (2) Carbonization: Transport the pretreated waste salt to the pulse carbonization device, use the high-temperature oxidation tail gas from the high-temperature oxidation device, heat the pretreated waste salt at 550°C, and carbonize the organic matter in the pretreated waste salt after 2s , to obtain 865 kg of carbonized waste salt; the carbonized tail gas from the outlet of the p...

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Abstract

The invention provides a method for preparing a refined industrial salt from an industrial waste salt and belongs to the technical field of resource environments. The method comprises the following steps: pretreating an industrial waste salt so as to remove a part of water and volatilizable organic matters in the industrial waste salt; performing carbonization so as to partially decompose organicmatters in the industrial waste salt; further performing high-temperature oxidation treatment so as to oxidize the organic matters in a waste carbon salt into carbon dioxide and water, and thoroughlyremoving the carbon dioxide and the water; and finally performing procedures of water dissolution, heavy metal and water-insoluble substance removal, evaporation crystallization, solid-liquid separation and drying, so as to obtain the refined industrial salt. The method provided by the invention is reasonable in principle and reasonable in designing, resource treatment on waste salts can be achieved with low cost, the national circular economy policy can be met, and remarkable economic and environment benefits can be made.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for preparing refined industrial salt by utilizing industrial waste salt. Background technique [0002] In my country's existing industrial system, especially in the fine chemical industry, a large amount of high-organic slag salt (mainly containing inorganic salts such as sodium chloride) will be produced in many production processes. This industrial waste salt contains a large amount of organic matter, and some also contain heavy metals or As for other impurities, according to analysis, the national output exceeds 10 million tons. Most of this waste salt has not been properly treated, which has brought huge risks to the ecological environment. The existing treatment methods mainly include landfill and stacking, and the slag salt with a salt content of more than 10% is restricted for landfill disposal; some units use water to dissolve and di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D5/16
CPCC01D3/14C01D5/16C01P2006/80C01P2006/82Y02P20/129
Inventor 李梅彤袁文蛟张柯周晶范文浩
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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